Home / 128,135.08-176,779.56-80,371

Finding the Fourth Proportional to 128,135.08, 176,779.56 and 80,371

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Solution

The fourth proportional to 128,135.08, 176,779.56 and 80,371 is: 110,882.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,135.08 : 176,779.56 = 80,371 : x
  2. Step 2: Convert to fraction form
    128,135.08/176,779.56 = 80,371/x
  3. Step 3: Cross multiply
    128,135.08x = 176,779.56 × 80,371
  4. Step 4: Simplify right side
    128,135.08x = 14,207,950,016.76
  5. Step 5: Solve for x
    x = 14,207,950,016.76/128,135.08
  6. Step 6: Final answer
    x = 110,882.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.